Please Install the Updated Packages.
Loganathan Parthipan discovered that Nova did not verify the size of QCOW2 instance storage. An authenticated attacker could exploit this to cause a denial of service by creating an image with a large virtual size with little data, then filling the virtual disk.
nova on Ubuntu 13.04 , Ubuntu 12.10 , Ubuntu 12.04 LTS
Updated on 2015-03-25